@article{MZM_1969_6_6_a4,
     author = {M. M. Gekhtman and I. V. Stankevich},
     title = {On a~boundary problem generated by a~self-adjoint {Sturm--Liouville} differential operator on the entire real axis},
     journal = {Matemati\v{c}eskie zametki},
     pages = {681--692},
     publisher = {mathdoc},
     volume = {6},
     number = {6},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1969_6_6_a4/}
}